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He put the warning out on the Cambridgeshire force’s ‘ecops’ messaging alert system.

People are urged to call 101 if they see any strange markings

The officer has urged residents to report any suspicious markings or twig and stone formations to police.

PCSO Braddick said: “Please be aware that special markings can be used by criminals to identify target properties. These markings could be white chalk marks on a wall or path, or small stones/twigs laid out in a certain way.

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“These signs are coded and can identify vulnerable, empty, elderly or leave alone properties. If you notice any strange markings or chalk marks close or near to your home please contact either myself or 101 and we will come out and take a look.”